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Regulatory Matters - Association's Actual Capital Amounts and Ratios (Detail) - Association [Member] - USD ($)
$ in Thousands
Jun. 30, 2020
Jun. 30, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Actual, Community Bank Leverage Ratio, Amount $ 76,428 $ 75,355
Actual, Total capital (to risk-weighted assets), Amount 82,662 81,624
Actual, Tier I capital (to risk-weighted assets), Amount   75,355
Actual, Common Equity Tier I capital (to risk-weighted assets), Amount   75,355
Actual, Tier I capital (to adjusted total assets), Amount 76,428 75,355
Actual, Tangible capital (to adjusted total assets), Amount $ 76,428 $ 75,355
Actual, Community Bank Leverage Ratio, Ratio 10.68%  
Actual, Total capital (to risk-weighted assets), Ratio   16.28%
Actual, Tier I capital (to risk-weighted assets), Ratio   15.03%
Actual, Common Equity Tier I capital (to risk-weighted assets), Ratio   15.03%
Actual, Tier I capital (to adjusted total assets), Ratio 10.68% 10.96%
Actual, Tangible capital (to adjusted total assets), Ratio 10.68% 10.96%
Minimum Capital Requirement, Community Bank Leverage Ratio, Amount $ 57,238  
Minimum Capital Requirement, Total capital (to risk-weighted assets), Amount   $ 40,119
Minimum Capital Requirement, Tier I capital (to risk-weighted assets), Amount   30,090
Minimum Capital Requirement, Common Equity Tier I capital (to risk-weighted assets), Amount   22,567
Minimum Capital Requirement, Tier I capital (to adjusted total assets), Amount 28,619 27,513
Minimum Capital Requirement, Tangible capital (to adjusted total assets), Amount $ 10,732 $ 10,317
Minimum Capital Requirement, Community Bank Leverage Ratio, Ratio 8.00%  
Minimum Capital Requirement, Total capital (to risk-weighted assets), Ratio   8.00%
Minimum Capital Requirement, Tier I capital (to risk-weighted assets), Ratio   6.00%
Minimum Capital Requirement, Common Equity Tier I capital (to risk-weighted assets), Ratio   4.50%
Minimum Capital Requirement, Tier I capital (to adjusted total assets), Ratio 4.00% 4.00%
Minimum Capital Requirement, Tangible capital (to adjusted total assets), Ratio 1.50% 1.50%
Minimum To Be Well Capitalised Under Prompt Corrective Action Provisions, Community Bank Leverage Ratio, Amount $ 57,238  
Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions, Total Capital (to risk-weighted assets), Amount   $ 50,149
Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions, Tier I capital (to risk-weighted assets), Amount   40,119
Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions, Common Equity Tier I capital (to risk-weighted assets), Amount   32,597
Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions, Tier I capital (to adjusted total assets), Amount $ 35,774 $ 34,392
Minimum To Be Well Capitalised Under Prompt Corrective Action Provisions, Community Bank Leverage Ratio, Ratio 8.00%  
Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions, Total Capital (to risk-weighted assets), Ratio   10.00%
Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions, Tier I capital (to risk-weighted assets), Ratio   8.00%
Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions, Common Equity Tier I capital (to risk-weighted assets), Ratio   6.50%
Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions, Tier I capital (to adjusted total assets), Ratio 5.00% 5.00%